code: def testNone(self):
      base = MPI.Get_address(None)
      addr = MPI.Aint_add(base, 0)
      self.assertEqual(addr, base)
      diff = MPI.Aint_diff(base, base)
      self.assertEqual(diff, 0)
  
file_path: mpi4py/test/test_address.py
imports: from mpi4py import MPI
  import mpiunittest
  from arrayimpl import array, numpy
label_desc: Use image node_id 3 for calling the TestAddress obj's underlying member method code with example usage: obj.testNone() without return types